Molding-machine.



S. M. COFFMAN.

MOLDINGVMACHINE. APPLICATION FILED MAY 26. 1913.

Patented N on 23, 1915.

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COLUMBIA PLANOGRAPH CO..WI\SHINGTON, D. c,

-S. M. COFFMAN.

MOLDING MACHINE.

APPLICATION FILED MAY 26. 1913.

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nnrrn SAMUEL M. GOFFIVIAN, OF KANSAS CITY, MISSOURI.

MOLDING-MACHINE.

Specification of Letters Patent.

Patented Nov. 23, 1915.

Application filed May 26, 1913. Serial No. 769,865.

To all whom it may concern:

Be it known that I, SAMUEL M. COFFMAN, a citizen of the United States,residing at Kansas City, in the county of Jackson and State of Missouri,have invented certain new and useful Improvements in Molding- Machines,of which the following is a specification. V

This invention relates to improvements in molding machines, and myobject is to provide a machine of this character whereby various kindsof cement or concrete blocks and silo staves can be quickly andaccurately produced.

In order that the invention may be fully understood, reference will nowbe made to the accompanying drawings, in which:

Figure 1 is a broken side elevation of the machine. Fig. 2 is a planview of the machine. Fig. 3 is a broken section on line TITTII of Fig.2. Fig. 4 is a broken section on line IVIV of Fig. 2. Fig. 5 is a brokenside elevation of the machine with some of the parts in raised position.Fig. 6 is a detail of a matrix plate employed in carrying out theinvention.

I Tn carrying out the invention, I employ a mounted therein.

' 7 designates a pair of parallel arms pivotally-mounted at their rearends upon the rock-shaft 6 and unitedat their forward portions by atable 8 and a concave plate 9,

, which latter constitutes the rear wall of an adjustable matrix 10 inwhich the blocks are molded. The front wall of the matrix 10 is formedby a convex plate 11, and its-side walls by a pair of arms 12slidably-mounted on the outer surface of the arms 7, their rear portionsbeing loosely embraced and bar 11 secured at its ends to arms 12. Arms12 are provided at their forward ends with handles 15, whereby said armsand the parts connected thereto may be raised to the position shown onFig. 5. The arms 12 are supported in raised position by a U-shaped leg16, the upper ends of which are pivotallysecured to said arms by pins orscrews 17 Leg 16 is controlled by a trip-rod 18 pivotally-connected atits rear end to one of the up-turned ends of said leg 16 and bentoutward at its forward end to form a handle 19. The forward portion ofthe trip-rod 18 extends through an eye in a bracket 20, secured to theforward portion of the adjacent arm 12.

21 designates a rectangular hopper slidable on table 8, and guided by apair of plates 22, secured to the ends of said hopper andslidably-mounted upon a pair of rails 23, one of which is fixed to theouter surface of each arm 12. Backward movement of the hopper is checkedbyits rear wall contacting two stops 21 extending upward from arms 7 andforward movement of said hopper is limited by the handle 15.

24 designates a pair of connecting-bars pivotally-secured at theirforward ends to arms 12 and at their rear ends to cranks 25 secured uponthe ends of the rock-shaft 6 by set-screws 26. One of the cranks 25 hasan upward extension 27 to which the rear end of arod 28 is connected,said rod extending forwardly through an eye in bracket 20 and having itsfront end bent at right angles thereto to form a handle 29.

30 designates a plate secured to the upper portion ofone of standards 2and provided with stops 31 and 32 arranged in the path of one of thecranks 25,v to limit the movement thereof. Each connecting-rod 24 hasthree holes, designated respectively 33, 34, and 35 to receive atrunnion 36, whereby it is connected to the adjacent crank 25.

37 designates two pins to limit backward movement of arms 12 upon arms 7by contacting the members 13. Each pin 37 is adapted to enter any one ofthree holes in each arm 12, said holes being designated, respectively,38, 39 and 40.

41 designates an off-bearing board adapted to rest upon the forwardportion of the.

sills 3 and support the matrix 10, said offadapted to push theoff-bearing board 41 forward as will hereinafter appear.

47 designates a removable division plate any number of which maybeemployed to divide thexmatrix 1 0 into as many compartments as it isdesired to form blocks the blocks.

at the same time. p i p h 478 designates a removableconcave plate placedagainst one of theend walls of the matrix, and; 49 designates aremovable 1 convex plate placedagainst the opposite end wall of thematrix.

In practice, the material fromwhich the blocks are to be producedis,'=pla'ced in the matrix 10 through hopper 21 and tamped to-thedesired density, ,The surplus material is then scraped off by the edge10* of the hopper, latter is pushed backward against the stop pins213%,. vThe upper surfaces of the blocks are then troweled after whichthe arms 12 and the convex wall 11 of the matrix are slid forward toallow .said convex wall toclear the corresponding grooves in theadjacent edges of The forward movement of the convex wall 11 and arms 12is effected by pulling handle 29 forward to ,raise the cranksj25, whichpush the connecting bars 24 forward, causing themin turn toadvance thearms 12 until the extension 27contacts the 'stop32. As arms 12 adv ancethe pins 46 1contact the rear side of the off-bearing board 41 and pushthe same forward until the convex edges of the blocks thereon clear theconcave wall 9 of the matrix. Handles 15 are then grasped and the arms'12 and parts connected thereto swung upward to the positiondisclosed'by Fig. 5, where they are supported by leg 16 whichautomatically drops to vertical position and rests upon sills 3 whenhandles 15.are released. When the matrix 10 is raised to clearthejblocks, the'plates 47 48 and'4 9 are removed from said blocks,before the same are carried ofi. ,The ofi -bearing board 41, containingthe blocks, is then removed and another substituted .therefor, which isplaced in positionagainst'thegage members 43. If it is desired totemporarily lower the arms 12 and parts carried thereby, it can bereadily accomplished by folding leg 16- through the intermediacy of thetrip-rod backward movement of arms 12 lowers the cranks 25 through theintermediacy of the connecting-bars 24. The parts are lowered in thesame motion in which the arms 12 are pushed backward until the pins 37contact 'the members 13, which occurs .at the same time that one of thecranks 25 contacts the stop 31. hen the parts are in loweredposition,:arms 12 arelocked from accidental backward movement by theconnecting bars 24, the pivotal points ,of which pass below the centerof rock-shaft 6 and thus prevent the cranks 25 from rising untilactuated by rod 28. By thus locking the arms 12 from back-ward movementthe front wall 11 of the matrix is firmly held in place while thematerial in said matrix is being tamped, hence the blocks will be ofuniform size.

The matrix can be adjusted to make narrow blocks by placing pins 37 inholes 38, removing trunnions 36 from holes 34, and pushing arms 12backward until pins 37 contact members 13, .afterwhich trunnions 36 areplaced in holes 33 of the connectingbars. Pins ,46 are then placed inthe holes 45 in order to=contact the off-bearing board at the propertime. The matrix-can also be readily adjusted to increase the .width ofthe blocks by placing pins 37 in holes 40, placing the trunnion-s 36through the holes 35 of the connecting-bars 24, and placing pins 46 inthe holes 45.

.By mounting the machineupon runners it can be readily drawn from placeto place as required. 7 i

When it is desired to produce blocks without grooves and correspondingbeadsor and means controlled the slidable walls to move the offlbearingboardin one direction through part ofthe movement of said slidablewalls. p v

2. In a, machine of the character described, an off-bearing board, asupport therefor, a matrix adapted torest upon said ofl' bearing board,said matrix consisting of through a part of the movement of tlieslidslidable walls and a relatively stationary able walls. 10 wall someof which have concave and others In testimony whereof I aifix mysignature convex surfaces, angle irons secured to two in the presence oftwo witnesses.

of the sliclable walls and provided with a SAMUEL M. COFFMAN. pluralityof holes, and pins adapted to be Witnesses:

placed in any of said holes to engage and F. G. FISCHER,

move the off-bearing board in one direction L. J. FISCHER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

